Glarb, Calamity's Augur

Sultai's answer to top-deck card advantage has usually meant playing the whole deck blind: Future Sight and Bolas's Citadel let you cast off the top at the cost of visibility or a life tax. This frog draws its line at mana value four. Lands and the expensive payoffs can be played straight from the library; anything cheaper still has to be drawn into hand the old-fashioned way, which turns the surveil into a scalpel rather than a shovel. The tap ability is not clearing junk out of your draw step; it is arranging your future cards so the big spells land where the static permission can reach them and the mid-cost ones fall into your hand. That interlock is the point: surveil sculpts what sits on top, the top-card permission cashes it, and the two abilities feed each other on a loop a plain deck-off-the-top engine never closes. Note the permission does not discount anything; you still pay the full cost, so what it buys is access rather than tempo, a steady stream of your best cards without spending draws to find them. Deathtouch on a 2/4 is the tax that keeps an engine this recursive from being a free ride: it wants to sit back and stall, and the body commits to that by making it a wall that punishes attackers rather than a clock. What separates it from its ancestors is discipline of scope. Future Sight sees everything and demands you build to enable it; this narrows the permission to the heavy cards that were always worth committing to, then hands you a repeatable way to put them where they can be reached.